Which Javascript version(s) does IE8 supports?

Question

According to Wikipedia, IE8 only supports Javascript 1.5. So they are saying IE8 completely ignores Javascript versions 1.6, 1.7, 1.8 and 1.9.

Should I trust? Is it true

Answer 1

Yes, that is true (at least as far as which language features are supported). You can easily check this using some Javascript 1.6 code:

alert([1,2,3].indexOf(2));

IE 8 throws an error.

Note that IE 8 might support some of the features added in later versions of Javascript. IE contains a lot of stuff outside the standards, so it's likely that some of it happens to be the same as the later additions.